/Engine/Source/Runtime/RenderCore/Public/RendererInterface.h
Ensure that any tiles requested by 'RequestVirtualTextureTilesForRegion' are loaded, must be called from render thread
void LoadPendingVirtualTextureTiles ( [FRHICommandListImmediate](API\Runtime\RHI\FRHICommandListImmediate) & RHICmdList, [ERHIFeatureLevel::Type](API\Runtime\RHI\ERHIFeatureLevel__Type) FeatureLevel )